题目

读“黄土高原示意图”(图4),回答19~21题。 19.黄土高原范围的叙述,正确的是( ) A.东起黄河      B.西至太行山         C.南抵秦岭  D.北至贺兰山 20.流经黄土高原的大河是 ( ) A.长江        B.黄河            C.淮河        D.珠江 21.黄土高原水土流失严重的主要原因有 ( ) A.地形平坦           B.植树种草         C.降水均匀           D.土质疏松Four of Robert's children were at the party, including ________, Luke. A. the oldest B. an oldest one C. the old D. an old one  
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